Beater element for pulverizing apparatus



March 23; 1943. o, CRNG 2,314,689

BEATER ELEMENT FOR PULVERIZING APPARATUS Filed Dec. 28, 1940 OLL LS'ON CRAIG v Patented Mar. 23, 1943 BE'ATER ELEMENT FOR PULVERIZING APPARATUS Ollison Craig, Worcester, Mass;, assignor to Riley Stoker Corporation, Worcester, Mass, a corporation of Massachusetts Application December 28, 1940, Serial No. 372,102

TENT i iilh 4 Claims.

This invention relates to beater elements for pulverizing apparatus, and is an improvement over the construction disclosed in the patent to Armour, No. 1,941,923, dated January 2, 1934.

The beater elements disclosed in said prior patent are adapted for use in pulverzing apparatus of the general type shown in my prior Patent No. 1,714,080, dated May 21, 1929. These elements comprise a rotor wear plate shaped as chine in proper operating condition.

utilized.

plate.

pended hereto.

reference numerals indicate like parts,

Fig. 3 is a perspective view of one of the beater elements removed from the rotor.

The embodiment illustrated in the drawing comprises a flat circular rotor disk It which is identical with the disk disclosed in my prior Patent No. 1,714,080 and is intended to be rotatably mounted in a pulverizing apparatus of the same general type as that shown in said patent. The peripheral portion of this disk at the a circular ring sector, with a peg extending from side toward the pulverizer inlet '(not shown) is one face of the plate near its outer peripheral protected by means of wear plates I! (Fig. '2) edge, and a pair ofpegs extending from the said which may be oil the same general construction face and spaced inwardly from the first peg toas the corresponding parts shown in my said ward the axis. All the pegs are located in a sym v patent. The beater elements 52 on the opposite metrical arrangement relative to the radial censide of the disk are the subject matter of the ter line of the plate. At assembly each of the present invention. inner pegs is located closely adjacent to a peg Each beater element l2 comprises a wear plate on the adjoining element, and in effect these two It having an inner edge l5 and an outer edge adjacent small pegs form a single large peg havor periphery l6. These edges !5 and is are ing two separable halves. In the operation of shaped as concentric circular arcs having their the machine one of these halves is located in common center on the axis of the disk Ill, the two front of the other and hence is subjected to much edges being offset from one another in a circummore rapid wear from the abrasive action of the ierential direction. The edges 15 and 16 are material being pulverized. When this wear has connected by two straight inwardly-converging become sufiiciently extensive to Weaken the front side edges It both of which are located on lines half of the peg so that there is danger of this 20 (Fig. 1) tangential to a common circle 2|, half breaking away from the plate and possibly this circle being concentric with the arcs l5 and wrecking the machine, it is necessary to replace it. Thus the plate may be described as a circuthe entire element, even though the rear half of lar ring sector with its inner and outer edges offthe peg may be scarcely worn at all. Conseset in a circumferential direction. A flang 23 is quently an appreciable expense is involved for provided on the rear face of each plate adjacent replacement parts in order to maintain the mathe outer edge [6 thereof, this flange overlying the outer edge of the disk in at assembly, as

It is accordingly one object of the invention to shown in Fig. 2. A cylindrical projection 24 exprovide a beater element which will have a longer tends from the rear face of the plate and fits an life of useful service than elements heretofore opening in the disk, thereby serving to locate the plate properly on the disk.

It is a further object of the invention to pro- The plates I4 are bolted to the rotor disk, and vide a beater element or" the type having a wear for this purpose a half bolt hole 26 is provided on plate and pegs projecting therefrom so construct- 40 each side edge 1 8 thereof near the outer edge l6, ed that the pegs may become cons deramy Wor and a bolt hole 2'! is provided inwardly of the without danger of their breaking away from the holes 26 and on the radial line midway between the same. These bolt holes 26 and 21 are pro- With these and other objects in view, as will be vided with cylindrical counterbores 28 and 29 reapparent to those skilled in the art, the invenspectively to receive the hexagonal nuts 3| of tion resides in the combination of parts set forth plow bolts 32 which secure the plates l4 and H in the specification and covered by the claims apt t d k Pulverization of the material passing through Referring to the drawing illustrating one emthe machine is efiected by the action of pegs exbodiment of the invention, and in which like tending from the front or exposed faces of the plates. In the embodiment illustrated each plate Fig. 1 is an elevation of a portion of a pu is provided h two integral pr j n pe s. verizer rotor, viewed from the discharge side; One large peg 34 of substantially rectangular Fig. 2 is a section on the line 2-2 of Fig. 1; cross section is located adjacent the outer edge I6 of the plate and midway between the two bolt and holes 26. One somewhat smaller peg 35 of substantially rectangular cross section is located between the inner bolt hole 21 and the side edge more remote therefrom. The inner peg 35 is ofiset from the outer peg 34 in the same direction as the inner edge I5 of the plate is offset, and the bolt hole 21 is in substantial radial alignment with the outer peg. It will be apparent from Fig. 1 that at assembly the pegs 34 and 35 provide outer and inner annular rows of pegs. In each row the bolts alternate with the pegs, so that the bolts are well protected from abrasion regardless of the direction of revolution, and right and left constructions are unnecessary.

Because of the circumferential offsetting of the inner and outer edges of the plate, the inner peg 35 can be made of suificient size to ensure a long life of useful service. Since there is no need for forming this peg of two parts located on separate elements, the beater elements can safely remain in use for much longer periods than has been possible with prior constructions.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A beater element for a pulverizing apparatus comprising a rotor wear plate having inner and outer edges shaped as concentric circumferentially-oifset circular arcs and two straight inwardly converging side edges located on lines tangential to a common circle concentric with the said arcs, and a peg projecting from one face of the plate.

2. A beater element for a pulverizing apparatus comprising a rotor wear plate having its outer periphery offset circumferentially from its inner edge, the plate having a half bolt hole at each side edge adjacent its outer periphery and a bolt hole located inwardly of the half bolt holes and on the radial line midway between the same, a peg projecting from the plate adjacent the outer periphery and between the half bolt holes, and a peg projecting from the plate between the inner bolt hole and the side edge more remote therefrom.

3. A beater element for a pulverizing apparatus comprising a rotor wear plate having inner and outer edges shaped as concentric circumferentially-offset circular arcs and two straight in- ;wardly converging side edges located on lines tangential to a common circle concentric with the said arcs, the plate having a half bolt hole at each side edge adjacent its outer periphery and a bolt hole located inwardly of the half bolt holes and on the radial line midway between the same, a peg projecting from the plate adjacent the outer periphery and between the half bolt holes, and a peg projecting from the plate between the inner bolt hole and the side edge more remote therefrom.

4. A beater element for a pulverizing apparatus comprising a rotor wear plate shaped as a circular ring sector with its inner and outer edges ofiset in a circumferential direction, a peg projecting from the plate adjacent its outer periphery, the plate having bolt holes on opposite sides of the peg, and a second peg projecting from the plate inwardly of the first peg and offset therefrom in the same direction as the inner edge of the plate is ofiset, the plate having a bolt hole located at one side of the second peg and. in substantial radial alignment with the first peg.

OLLISON CRAIG. 

